Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » sci.math.* » sci.math.independent

Topic: Power equation
Replies: 4   Last Post: Apr 26, 2012 5:58 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Dave Dodson

Posts: 690
Registered: 12/13/04
Re: Power equation
Posted: Apr 26, 2012 1:22 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On Thursday, April 26, 2012 10:47:43 AM UTC-5, Diogo Alves wrote:
> In the following equation:
>
> c = sum_i( ( p(i)^a ) * b(i) ) / sum_i( p(i)^a )
>
> "c", "p(i)" and "b(i)" are known.
> How do I calculate "a"?


Write
f(x) = sum_i( ( p(i)^x ) * b(i) ) / sum_i( p(i)^x ) - c
and use a numeric technique such as Newton's Method to solve the equation f(x) = 0.

Dave



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.